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Abstract:

A securing structure for an optical piece is disclosed and which
comprises: a hub portion; a surrounding portion connected to the hub
portion; a plurality of recess structures formed or otherwise provided in
at least one of the hub portion and the surrounding portion and which are
at least partially open on at least one side; and a rib structure that at
least partially separates the plurality of recess structures, The
structure is capable of use with an apparatus for securing and clamping
optical lenses (e.g., spectacle lenses) requiring edge-machining.

Claims:

1. A securing structure for an optical piece comprising: a hub portion; a
surrounding portion connected to the hub portion; a plurality of recess
structures formed or otherwise provided in at least one of the hub
portion and the surrounding portion and which are at least partially open
on at least one side; and a rib structure that at least partially
separates the plurality of recess structures.

2. The securing structure of claim 1, wherein the at least one side
includes a surface for receiving the optical piece.

4. The securing structure of claim 3, wherein each of the two recess
structures is bounded by a plurality of surfaces including either: (i) a
flat or substantially flat side surface, an arcuate side surface and an
interior surface; or (ii) a plurality of flat or substantially flat side
surfaces, an arcuate side surface and an interior surface.

5. The securing structure of claim 3, wherein each of the two recess
structures is at least substantially partially cylindrical in shape.

6. The securing structure of claim 5, wherein each of the two of recess
structures are symmetrically disposed in relation to one another.

7. The securing structure of claim 6, further comprising a plurality of
planes of symmetry and wherein the two recess structures are each
symmetrically disposed about at least a respective one of the plurality
of planes of symmetry.

8. The securing structure of claim 7, wherein the respective one the
plurality of planes of symmetry at least partially coincides with at
least a portion of the rib structure.

9. The securing structure of claim 8, wherein the respective one of the
plurality of planes of symmetry bisects or at least substantially bisects
the at least a portion of the rib structure.

10. The securing structure of claim 6, further comprising a plurality of
planes of symmetry and wherein the two recess structures are
symmetrically disposed about the plurality of planes of symmetry, and
wherein one of respective plurality of planes of symmetry at least
substantially bisects at least a portion of the rib structure and wherein
another of the plurality of planes of symmetry at least substantially
bisects each of the two recess structures.

11. The securing structure of claim 10, wherein the surface for receiving
the optical piece includes a contour that is generally convex and at
least a portion of the surface coincides with a surface of the rib
structure.

12. The securing structure of claim 11, wherein the two recess structures
are configured to allow air held within the recess structures to escape
during bonding of the securing structure to the optical device, thereby
increasing adhesion of the securing structure to the optical piece during
optical piece machining.

13. The securing structure of claim 12, wherein the surrounding portion
is at least one of integrated, provided or integrally formed with respect
to the hub portion in a resilient manner.

14. The securing structure of claim 13, wherein the surrounding portion
includes a plurality of drive elements.

15. The securing structure of claim 14, wherein the hub portion and the
surrounding portion are configured to permit flexible deformation between
surrounding portion and hub portion so as to permit adaptation of the
securing member to a shape of the optic piece.

17. The securing structure of claim 16, wherein each of the four recess
structures is bounded by a plurality of surfaces including a plurality of
flat or substantially flat side surfaces, an arcuate side surface and an
interior surface.

18. The securing structure of claim 16, wherein each of the four recess
structures is at least substantially partially cylindrical in shape.

19. The securing structure of claim 18, wherein each of the four recess
structures are symmetrically disposed in relation to one another.

20. The securing structure of claim 19, further comprising a plurality of
planes of symmetry and wherein the four recess structures are
symmetrically disposed about at least a respective one of the plurality
of planes of symmetry.

21. The securing structure of claim 20, wherein the respective one the
plurality of planes of symmetry at least partially coincides with at
least a portion of the rib structure.

22. The securing structure of claim 21, wherein the respective one of the
plurality of planes of symmetry bisects or at least substantially bisects
the at least a portion of the rib structure.

23. The securing structure of claim 19, further comprising a plurality of
planes of symmetry and wherein the four recess structures are
symmetrically disposed about the plurality of planes of symmetry, and
wherein the rib structure includes a plurality of portions and one of the
plurality of planes of symmetry at least partially coincides with at
least a portion of one of the plurality of portions of the rib structure,
and another of the plurality of planes of symmetry at least partially
coincides with at least a portion of another of the plurality of portions
of the rib structure.

24. The securing structure of claim 23, wherein the surface for receiving
the optical piece includes a contour that is generally convex and a
portion of the surface coincides with a surface of the rib structure.

25. The securing structure of claim 24, wherein the four recess
structures are each configured to allow air held within the recess
structures to escape during bonding of the securing structure to the
optical device, thereby increasing adhesion of the securing structure to
the optical piece during optical piece machining.

26. The securing structure of claim 25, wherein surrounding portion is at
least one of integrated, provided or integrally formed with respect to
the hub portion in a resilient manner.

27. The securing structure of claim 26, wherein the surrounding portion
includes a plurality of drive elements.

28. The securing structure of claim 27, wherein the hub portion and the
surrounding portion are configured to permit flexible deformation between
surrounding portion and hub portion so as to permit adaptation of the
securing member to a shape of the optic piece.

30. A securing structure for an optical piece comprising: a hub portion;
a surrounding portion connected to the hub portion; a plurality of at
least substantially partially cylindrically shaped recess structures
formed or otherwise provided in at least one of the hub portion and the
surrounding portion, the plurality of recess structures at least
partially open on at least one side that includes a surface for receiving
the optical piece; and a rib structure that at least partially separates
the plurality of recess structures.

31. The securing structure of claim 30, wherein each of the plurality
recess structures is bounded by a plurality of surfaces including: (i) a
flat or substantially flat side surface, an arcuate side surface and an
interior surface; or (ii) a plurality of flat or substantially flat side
surfaces, an arcuate side surface and an interior surface.

32. The securing structure of claim 30 wherein each of the plurality of
recess structures are symmetrically disposed in relation to one another.

33. The securing structure of claim 30, further comprising a plurality of
planes of symmetry and wherein the plurality of recess structures are
symmetrically disposed about at least a respective one of the plurality
of planes of symmetry.

34. The securing structure of claim 33, wherein the respective one the
plurality of planes of symmetry at least partially coincides with at
least a portion of the rib structure.

35. The securing structure of claim 34, wherein the respective one of the
plurality of planes of symmetry bisects or at least substantially bisects
the at least a portion of the rib structure.

36. The securing structure of claim 35, further comprising a plurality of
planes of symmetry, wherein the rib structure includes a plurality of rib
portions, and wherein the plurality of recess structures are
symmetrically disposed about the plurality of planes of symmetry such
that one of the plurality of planes of symmetry at least partially
coincides with at least a portion of one of the plurality of portions of
the rib structure, and another of the plurality of planes of symmetry at
least partially coincides with at least a portion of another of the
plurality of portions of the rib structure.

37. The securing structure of claim 30, wherein the surface for receiving
the optical piece includes a contour that is generally convex and a
portion of the surface coincides with a surface of the rib structure.

38. The securing structure of claim 30, wherein the recess structures are
configured to allow air held within the recess structures to escape
during bonding of the securing structure to the optical device, thereby
increasing adhesion of the securing structure to the optical piece during
optical piece machining.

39. The securing structure of claim 30, wherein the hub portion and the
surrounding portion are configured to permit flexible deformation between
surrounding portion and hub portion so as to permit adaptation of the
securing member to a shape of the optic piece, and at least a portion of
the rib structure is configured to support at least a portion of the
optic piece upon such adaptation of the securing member to the shape of
the optic piece.

40. The securing structure of claim 30, further comprising a first
dimension at least generally corresponding to a diameter of a circular
region or perimeter of a portion of the surrounding portion and a second
dimension at least generally corresponding to an additional, smaller,
diameter of another circular region or perimeter of another portion of
the surrounding portion, and wherein the second dimension further at
least generally corresponds to a distance separating opposing surfaces of
the symmetrically disposed recess structures.

41. The securing structure of claim 30, further comprising a first
dimension at least generally corresponding to a length of the surrounding
portion, a second dimension at least generally corresponding to a width
of the surrounding portion, and a third dimension at least generally
corresponding to a curvature of an end of the surface for receiving the
optical piece.

Description:

RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. provisional patent
application No. 61/453,513, which was filed on Mar. 16, 2011 and entitled
"Securing Structure for Optic Device", and which is hereby incorporated
by reference herein in its entirety.

FIELD OF THE INVENTION

[0002] The invention relates to a securing structure, and more
particularly to a securing structure for use in and/or with an apparatus
for optical pieces requiring edge-machining, for instance optical lenses,
including spectacle lenses.

BACKGROUND

[0003] One purpose of optic piece (e.g., lens) edge-machining is to finish
an edge of the piece. For example, a spectacle lens is typically finished
in such a way that the lens may be inserted into a spectacle frame.
Various arrangements or systems are known which serve to mount the lens
for edge-machining and to clamp or otherwise secure it between rotatable
holding shafts of a lens edge-machining machine. As used herein,
spectacle lenses can mean optical lenses or lens blanks for spectacles
made of the usual materials, such as polycarbonate, inorganic glass,
CR-39, HI-Index etc., and with circumferential edges of any shape, which
lenses or lens blanks may be, but do not have to be, machined on one or
both optically effective surfaces prior to machining of the edge thereof.

[0004] Lens edge finishing systems can comprise, among other structures, a
securing structure (also frequently termed a "block" or "blocking
member"), which may be attached detachably to one side of the lens; an
adapter for the securing or blocking structure, which may be connected
rigidly to one of the holding shafts of the lens edge-machining machine
and can be constructed for rotation angle-oriented rotary drive of the
securing or blocking structure; and a clamping assembly, which can
comprise a fastening portion, connectable rigidly to the other holding
shaft of the lens edge-machining machine, and a clamping portion which
can be connected to the fastening portion, and which clamping portion can
be constructed for force-locking engagement with the other side of the
lens. The securing structure can be attached to the optical lens by means
of an adhesive film portion or pad which can include adhesive on both
sides.

[0005] To date, securing structures have suffered from or been susceptible
to various drawbacks. For instance, an amount of air may enter between
the lens being finished or machined, which can result in reduced bonding
or adhesion between the lens and the securing structure. Reduced bonding,
in turn, can tend to result in some amount of shifting and/or rotation of
the lens (e.g., relative to the securing structure or overall finishing
assembly) during a machining operation.

[0006] It would be desirable to provide a new securing structure that
overcomes the aforementioned and other drawbacks. Further, it would be
desirable to provide a new securing structure that can be manufactured in
a cost-effective manner.

SUMMARY

[0007] In accordance with one aspect of the present disclosure, disclosed
herein is a securing structure for an optical piece comprising: a hub
portion; a surrounding portion connected to the hub portion; a plurality
of recess structures formed or otherwise provided in at least one of the
hub portion and the surrounding portion and which are at least partially
open on at least one side; and a rib structure that at least partially
separates the plurality of recess structures.

[0008] Other embodiments, aspects, features, objectives and advantages of
the present disclosure will be understood and appreciated upon a full
reading of the detailed description and the claims that follow.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Embodiments are disclosed with reference to the accompanying
drawings and are for illustrative purposes only. The present disclosure
is not limited in its application to the details of construction or the
arrangement of the components illustrated in the drawings. The present
disclosure encompasses other embodiments and is capable of being
practiced or carried out in other various ways. The drawings illustrate a
best mode presently contemplated for carrying out the invention. Like
reference numerals may be used to indicate like components.

[0010] In the drawings:

[0011] FIG. 1 is a perspective exploded representation of an apparatus for
securing and clamping a lens (e.g., a spectacle lens, an ophthalmic lens,
etc.) requiring edge-machining, which representation shows, from the
bottom upwards, a securing structure adapter mounted on a schematically
illustrated lower holding shaft, a securing structure, an adhesive film
portion, the lens (e.g., a spectacle lens) and a clamping assembly
mounted on a schematically illustrated upper holding shaft, taken
together and each individually in accordance with at least some
embodiments of the present disclosure;

[0012] FIG. 2 is a sectional view of the arrangement shown in FIG. 1 in a
functional or operational position in accordance with at least some
embodiments of the present disclosure;

[0013] FIG. 3 is a sectional view of the clamping assembly according to
FIG. 2 on an enlarged scale relative to FIG. 2, again in accordance with
at least some embodiments of the present disclosure;

[0014] FIG. 4 is a sectional view along the section line FIG. 4-FIG. 4 of
FIG. 3 on a reduced scale relative to FIG. 3, in accordance with at least
some embodiments of the present disclosure;

[0015] FIG. 5 is a broken-open side view of the securing structure
according to FIG. 2 mounted on the securing structure adapter on an
enlarged scale relative to FIG. 2, in accordance with at least some
embodiments of the present disclosure;

[0016] FIGS. 6A-6B are a bottom perspective view and a view from below (or
a bottom view), respectively, of the securing structure shown in FIG. 5,
and each on a somewhat enlarged scale relative to FIG. 5, in accordance
with at least some embodiments of the present disclosure;

[0017] FIGS. 7A-7B are sectional views of the securing structure along
section lines FIG. 7A-FIG. 7A and FIG. 7B-FIG. 7B, respectively, in FIG.
6B, and each on a somewhat enlarged scale relative to FIG. 6B, in
accordance with at least some embodiments of the present disclosure;

[0018] FIG. 8 is a plan view of the securing structure adapter shown in
FIG. 5 on a somewhat enlarged scale relative to FIG. 5, in accordance
with at least some embodiments of the present disclosure;

[0019] FIG. 9 is a sectional view of the securing structure adapter along
section line FIG. 9-FIG. 9 of FIG. 8, rotated by 90 degrees in the
clockwise direction in the drawing plane, in accordance with at least
some embodiments of the present disclosure;

[0020] FIG. 10 is a plan view of the adhesive film portion according to
FIG. 1 on an enlarged scale relative to FIG. 1, in accordance with at
least some embodiments of the present disclosure;

[0021] FIG. 11 is a schematic, broken-away cross-sectional view of the
adhesive film portion according to FIG. 10 on a very enlarged scale, in
accordance with at least some embodiments of the present disclosure;

[0022] FIG. 12 is a sectional view of the securing structure along section
line FIG. 12-FIG. 12 of FIG. 6B, and on a somewhat enlarged scale
relative to FIG. 6B, in accordance with at least some embodiments of the
present disclosure;

[0023] FIG. 13 is atop perspective view of the securing structure of FIGS.
6A-6B, including plurality of recess portions or structures and a rib
structure, in accordance with at least some embodiments of the present
disclosure;

[0024] FIG. 14 is a top view of FIG. 13;

[0025] FIG. 15 is a top perspective view of another securing structure,
again including plurality of recess portions or structures and a rib
structure in accordance with at least some embodiments of the present
disclosure;

[0026] FIG. 16 is a top view of FIG. 15;

[0027] FIG. 17 is a top perspective view of another securing structure,
again including plurality of recess portions or structures and a rib
structure, in accordance with at least some embodiments of the present
disclosure;

[0028] FIG. 18 is a top view of FIG. 17;

[0029] FIG. 19 is a top perspective view of another securing structure,
again including plurality of recess portions or structures and a rib
structure, in accordance with at least some embodiments of the present
disclosure;

[0030] FIG. 20 is a top view of FIG. 19;

[0031] FIGS. 21-22 are a bottom perspective view and a view from below (or
a bottom view), respectively, of the securing structure shown in FIG. 17
and/or FIG. 19 (with the understanding that there is some allowance for a
difference in overall aspect ratios or dimensions, such as height or
width, of the respective securing structures due to, for example,
variations in the lens that is ultimately to be finished using the
securing structures), and each on a somewhat enlarged scale relative to
FIGS. 17 and/or 19, in accordance with at least some embodiments of the
present disclosure;

[0032] FIG. 23 is a sectional view of the securing structure along section
line FIG. 23-FIG. 23 of FIG. 18, in accordance with at least some
embodiments of the present disclosure; and

[0033] FIG. 24 is a sectional view of the securing structure along section
line FIG. 24-FIG. 24 of FIG. 20, in accordance with at least some
embodiments of the present disclosure;

DETAILED DESCRIPTION

[0034] As is revealed by FIGS. 1 and 2, two exemplary rotatably mounted
holding shafts 10 and 12 (bearing system not shown) are provided in a
vertical functional and machining position on the arrangement for
securing and clamping a lens L, such as an optical or spectacle lens,
requiring edge-machining. Between the components and elements of and
connected to the shafts 10 and 12, which components and elements will be
described in more detail herein, there is arranged the lens L. Lens L is
clamped, so as to be held, between the holding shafts 10 and 12 is
reliably prevented from slipping during edge-machining. Such slippage
must not occur, particularly and by way of example, if the lens L is a
spectacle lens to be machined and which comprises a close-focus portion
aligned in angularly precise manner relative to the optical axis, or a
cylindrical or prismatic ground surface, the axial position of which must
be in a predetermined relationship to the position of the spectacle lens
mounted in the spectacle frame. While a vertical functional and machining
position is provided, it is to be understood that other positions and/or
orientations, such as horizontal, are contemplated and such orientation
disclosed and provided herein is by way of example only.

[0035] In accordance with at least some embodiments, tower holding shaft
12 is connected non-rotatably and coaxially to securing structure adapter
18, which is constructed in a manner yet to be described for angle of
rotation-oriented rotary drive of a securing structure 14, an exemplary
embodiment of which is shown, fitted removably to the securing structure
adapter 18. The securing structure 14 may be fixed detachably to one side
16 of the lens L. A clamping assembly 20 is fitted coaxially on the upper
holding shaft 10 and comprises a fastening portion 22 connectable rigidly
to the holding shaft 10 and a clamping portion 24 connected therewith.
The clamping portion 24 is constructed for force-locking engagement with
the other side 26 of the optical lens L.

[0036] In accordance with at least one aspect of the present disclosure,
constructing or otherwise providing the clamping assembly, or similar
assembly, according to the embodiments of the present disclosure allows
very precise, backlash-free (or at least substantially backlash-free)
torque transmission together with very smooth angle adjustment. The
spherical head mounted in the receiving portion thereof and having two
projections allows, in accordance with at least some embodiments,
movements superimposed in the manner of a cardan joint about two tilt
axes with virtually backlash-free rotary drive by the associated holding
shaft due to, at least in part, the engagement between the projections
and the channels in the receiving portion. Since the channel bottom of
each of the channels displays, in cross section, a shape complementary
and dimensionally matching, respectively, to the end zone of the
associated projection, form-fitting engagement is obtained between the
projections and the channels when viewed with the channel in cross
section and the pin in longitudinal section, which form-fitting
engagement is advantageous for backlash-free rotary motion transmission
between spherical head and receiving portion. The backlash-free torque
transmission thus obtained with low wear and at the same time very smooth
angle adjustment is a prerequisite for a highly precise edging of
spectacle lenses with machinery suitable for industrial production.
Precisely aligned orientation relative to the first tilt axis of the two
projections of the spherical head may be achieved, for example, by the
introduction of a pin, protruding on both sides beyond the spherical head
so as to form, for example, projections, into a through-hole which
extends with its central axis through the center of the sphere and
encloses the pin in play-free manner,

[0037] In accordance with at least some embodiments, the clamping assembly
20, the details of which are revealed clearly in particular by FIGS. 3
and 4, has a spherical head 30 provided with a projection 28 on each of
its opposing sides. As shown, the spherical head 30 is accommodated in a
receiving portion 32 and supported at the bottom on a truncated
cone-shaped ball bearing surface 33. In some embodiments, this may also
take the form of a portion of a spherical surface. The receiving portion
32 is provided with channels 34 extending parallel to the axis of
rotation D on opposing sides, which channels 34 serve for substantially
rotary play-free guidance of the projections 28. The clamping portion 24
may be swivelled cardanically relative to the fastening portion 22 about
a first tilt axis A perpendicular to the axis of rotation D of the
spherical head 30 and extending coaxially through the projections 28 and
about a second tilt axis B perpendicular to the axis of rotation of the
spherical head 30 and to the first tilt axis A. The torque introduced via
the holding shaft 10 is transmitted via the projections 28 from the
fastening portion 22 to the clamping portion 24.

[0038] The projections 28 provided on the spherical head 30 are formed by
a pin 36, which extends through a through-hole 38 in the spherical head
30. Each of the two projections 28 provided on the spherical head 30
comprises a cylindrical surface zone 40 protruding out of the
through-hole 38. The channels 34 in the receiving portion 32 each have
two opposing flat guide surfaces 42, which extend parallel to one another
and serve for substantially play-free guidance of the cylindrical surface
zones 40 of the projections 28. This guidance is not lost in the event of
swivel movements about the second tilt axis B within expected swivel
movement limits.

[0039] Each of the projections 28 provided on the spherical head 30
comprises an end zone 44, which takes the form of a spherical cap. As is
clear from FIG. 4, the channel bottom 46 of each of the two channels 34
provided in the receiving portion 32, when viewed in cross section,
displays a shape complementary to the spherical cap-shaped end zone 44 of
the associated projection 28. The end zones 44 of the projections 28 have
a sphere radius which is identical to the radius of the cross section of
the pin 36, i.e. the end zones 44 adjoin the pin 36 continuously,
including the cylindrical surface zones 40,

[0040] In contrast to the exemplary construction shown, the channels 34
may also have a rectangular cross section, wherein the channel width is
greater only by a small amount of movement play than the diameter of the
cylindrical surface zones 40 of the projections 28. In this instance, the
channel side walls form the guide surfaces 42. The sphere radii of the
end zones 44 do not have to correspond to the radius of the cylindrical
surface zones 40 or the radius of the cross section of the pin 36, but
may be greater than these. It has merely to be ensured that the length of
the pin 36, measured over the end zones, is smaller by an amount of
movement play than the spacing of the channel bottoms of the rectangular
channels. The sphere radius of the end zones 44 should be, however,
smaller than half the pin length.

[0041] The pin 36, in accordance with at least some embodiments of the
present disclosure, has a cylindrical basic member 48 forming the
cylindrical surface zones 40 of the projections 28. The basic member is
provided at both sides with the spherical cap-shaped end zones 44. The
pin 36 has a length which is smaller by an amount of movement play than
the diametrally measured spacing of the channel bottoms 46. The pin 36
may be accommodated in the through-hole 38 in the spherical head 30 in
axially displaceable manner.

[0042] The receiving portion 32 for the spherical head 30 is provided on
the clamping portion 24 of the clamping assembly 20 in accordance with
embodiments of the present disclosure. As is clearest from FIG. 3, the
spherical head 30 is held in the receiving portion 32 by means of a
two-part retaining ring 50 engaging behind the spherical head 30. The
two-part retaining ring rests on an annular shoulder 51, interrupted by
the channels 34, of a stepped bore 35 in the receiving portion 32
enclosing the spherical head 30 in its lower area 53 tightly but with
movement play (FIG. 4). The two-part retaining ring 50 is in turn held by
a snap ring 55, which engages in an annular channel 57 in the stepped
bore 35. In the arrangement shown, the spherical head 30 is a component
of the fastening portion 22 and is thus in one piece. Other arrangements
and embodiments are contemplated and considered within the scope of the
present disclosure.

[0043] In accordance with embodiments of the present disclosure, the
fastening portion 22 of the clamping assembly 20 comprises a locking
means 52, by means of which the clamping assembly 20 may be locked
detachably to the corresponding holding shaft 10 (FIGS. 2, 3). In the
example shown, the locking means 52 is a cylindrical sleeve 92 inserted
perpendicularly into a bore 90 in the fastening portion 22, from which
locking balls 94 project captively on both sides, which locking balls 94
are loaded divergently by a spring arrangement (not shown) within the
cylindrical sleeve 92. The locking balls 94 project beyond the external
circumference of the cylindrical fastening portion 22, such that they may
be locked together with a locking channel 96 inside a blind bore 98 in
the holding shaft 10 accommodating the fastening portion 22 (FIG. 2).
Other arrangements and embodiments are contemplated and considered within
the scope of the present disclosure.

[0044] The fastening portion 22 of the clamping assembly 20 is provided at
the end with a channel 54, into which a cross-pin 100 engages for
form-fitting rotary drive by the holding shaft 10, which cross-pin 100 is
introduced into a transverse bore in the holding shaft 10. This
transverse bore passes through diametrically opposing wall areas of the
holding shaft 10 defining the blind bore 98. Rotation of the holding
shaft 10 is thus transmitted via the cross-pin 100 to the fastening
portion 22 and thence via engagement of the projections 28 with the
channels 34 to the clamping portion 24.

[0045] In accordance with embodiments of the present disclosure, the
clamping portion 24 comprises a covering 56 for force-locking engagement
with the lens L, which covering 56 is in the shape of a circular ring in
the example shown. In at least some embodiments, it consists of or can
comprise a material, such as leather or synthetic leather, which is soft
in relation to the material of the lens L. The covering may be connected
with the tower surface of the clamping portion 24 by adhesion. If an
injection-moldable polymeric material is used for the covering 56, the
latter may also be constructed on its upper side with projections or the
like for form-fitting engagement with corresponding recesses or the like
in the tower surface of the clamping portion 24 (not shown). In
accordance with at least some embodiments of the present disclosure, the
covering comprises good adhesive power relative to the optical lens for
torque transmission and for the covering not to be capable of causing any
damage to the lens surface or thin layers attached thereto, such as
anti-reflection coatings.

[0046] In accordance with embodiments of the present disclosure, a groove
ring seal 102 in the form of an O-ring ensures a seal between the
fastening portion 22 and the holding shaft 10. It seals these elements
off from one another in the lower area of the blind bore 98. As is
indicated by dash-dotted lines in FIG. 2, the holding shaft 10 and the
clamping portion 24 may be connected together by a tubular or hose-shaped
flexible collar 104. Due at least in part to its flexibility, this collar
typically does not prevent cardanic movements of the clamping portion 24
relative to the holding shaft 10, but does at least typically seal the
receiving portion 32 effectively against the penetration of contaminants
such as grinding dust. In accordance with an aspect of the present
disclosure, the collar 104 may have the tendency, especially if it
comprises rubber or an elastomeric plastics material, to adopt its
extended hollow-cylindrical position, whereby it exerts a pre-centering
action on the clamping portion 24 prior to engagement with the lens L.

[0047] Securing structure 14, securing structure adapter 18 and their
mutual association together with their connection with tower holding
shaft 12 are initially described with reference to FIGS. 1 and 2, in
conjunction with FIGS. 5 to 9, and in accordance with at least some
embodiments of the present disclosure.

[0048] For form-fitting rotary drive of the securing structure 14 by the
securing structure adapter 18, these components each comprise rotary
drive elements, which in accordance with exemplary embodiments are
toothed, and which will be described in more detail below. Furthermore,
securing structure 14 and securing structure adapter 18 likewise each
comprise positioning elements, exemplary embodiments of which are
described in more detail below, and which have the task of orienting or
positioning securing structure 14 and securing structure adapter 18
correctly relative to one another with regard to angle of rotation prior
to engagement of the rotary drive elements.

[0049] In accordance with at least some embodiments of the present
disclosure, positioning elements comprise a plurality of asymmetrically
arranged projections 58 and a plurality of complimentarily associated,
correspondingly asymmetrically arranged recesses 62. The projections 58
may either be arranged on the securing structure 14 or on the securing
structure adapter 18. The same is true of the recesses 62, i.e. if the
projections 58 are located on the securing structure 14, the recesses 62
are arranged on the securing structure adapter 18. If, on the other hand,
the projections 58 are arranged on the securing structure adapter 18, the
recesses 62 are arranged on the securing structure 14. As illustrated,
the projections 58 are constructed or otherwise provided on the securing
structure adapter 18, while the recesses 62 are provided on the securing
structure 14.

[0050] In accordance with embodiments of the present disclosure, the end
faces 60 of the projections 58 lie in a common plane perpendicular to the
axis of rotation D (FIGS. 8, 9). The recesses 62 start from a flat
surface 64 perpendicular to the axis of rotation D (FIGS. 5, 6, 7). In
accordance with at least some embodiments of the present disclosure, the
arrangement is such that, at the securing structure 14, the axial
distance a (FIG. 7) between the rotary drive elements and the positioning
elements, i.e. the flat surface 64 from which the recesses start, is
different from, i.e. greater than, the axial distance b (FIG. 9) on the
securing structure adapter 18 between the rotary drive elements and the
positioning elements, i.e. the common plane of the end faces 60

[0051] of the projections 58.

[0052] In accordance with embodiments of the present disclosure, the
securing structure 14 may be united in the manner indicated below with
the securing structure adapter 18 to yield the desired angularly correct
engagement situation illustrated in FIG. 5. If the securing structure 14
is moved axially towards the securing structure adapter 18 and
orientation with regard to angle of rotation of securing structure and
securing structure adapter has not yet been achieved, first of all the
projections 58 come to rest with their end faces 60 against the flat
surface 64. Then, to affect the sole correct orientation with regard to
angle of rotation, the securing structure 14 is turned relative to the
securing structure adapter 18, wherein the end faces 60 slide on the flat
surface 64 without the securing structure 14 effecting a tilting movement
relative to the securing structure adapter 18, which tilting movement
could undesirably bring the rotary drive elements partially into
engagement. In accordance with at least some embodiments of the present
disclosure, due to the matching asymmetrical arrangement of the
projections 28 and the recesses 62, typically only one correct rotation
angle orientation is possible. If the correct relative rotation angle
orientation is achieved between securing structure 14 and securing
structure adapter 18, the projections 58 enter the recesses 62 when moved
axially closer together, whereupon the rotary drive elements, which are
toothed on both sides, finally move into engagement with one another, as
shown in FIG. 5, such that torque may be transmitted from the holding
shaft 12 to the securing structure 14. Moreover, with such arrangements,
the two holding shafts 10 and 12 are driven synchronously at the same
speed of rotation.

[0053] Further in accordance with at least some embodiments of the present
disclosure and to ensure that the end faces 60 lie temporarily in
tilt-safe manner against the fiat surface 64, the three projections 58
provided in the exemplary embodiment and naturally also the recesses 62
form the corners of a triangle. However, it must be ensured that the
triangle is not equilateral, with the corners thereof at the same radial
distance from the axis of rotation, because three different engagement
positions displaced by 120 degrees relative to one another would then be
possible. The projections and the recesses should be arranged
asymmetrically with different radial distances from the axis of rotation.

[0054] To simplify introduction of the projections 58 into the recesses
62, the projections 58 and/or the recesses 62 can exhibit or otherwise
comprise bezels starting respectively from the end faces 60 of the former
or the flat surface 64. Bezels at the inlet openings of the recesses 62
are not shown in the drawings.

[0055] As is clearest in FIGS. 7A-7B in accordance with at least some
embodiments of the present disclosure, the securing structure 14 has a
hub portion 68, on which the positioning elements are provided, i.e. the
recesses 62 starting from the flat surface. In accordance with at least
some embodiments of the present disclosure, the hub portion 68 is
connected to a surrounding portion 70 which, in accordance with at least
some embodiments, is concentric thereto, which bears or otherwise bears
the toothed drive elements (e.g., rotary drive elements), and which in
the present embodiment takes the form of an annular portion. In
accordance with at least some embodiments of the present disclosure, the
connection between the hub portion 68 and the surrounding portion 70 can
be provided by structure(s) 72, such as web(s), distributed around the
perimeter (e.g., continuously or as discrete structures about the
perimeter). This is easily achieved if the securing structure 14 is
injection-molded altogether from a flexible PU-based thermoplastic (e.g.
Elastollan®). In accordance with at least some embodiments of the
present disclosure, the securing structures can be made from
Elastollan®, for example under the material or trade names "C90/A13"
and/or "C90/A55", which are available from Channel Prime Alliance,
located in Des Moines, Iowa, and which are manufactured by BASF,
headquartered in Ludwigshafen, Germany. Such materials can provide good
compression set and high resilience, along with resistance to impacts,
abrasions, tears, weather, among other qualities. Still, other materials
for making the securing structures of the present disclosure are
contemplated and considered within the scope of the present disclosure.
Also, instead of the structure(s) described above as distributed about
the perimeter, however, another structure(s) (e.g., a thin-walled
resilient circumferential connecting wall) may be provided between the
hub portion 68 and the surrounding portion 70 and, although not shown,
such structure(s) can take the place of gap 73.

[0056] As is clear in particular from FIGS. 6A-B, 7A-B and 8, 9, the
rotary drive elements are formed on the securing structure 14 and the
securing structure adapter 18 by complementary toothing 74 or 76, which
in the present embodiment take the form of annular toothing and which are
provided and described herein in accordance with at least some
embodiments of the present disclosure. This toothing 74 and 76 is,
slightly conical, being convexly conical on the securing structure 14 and
concavely conical on the securing structure adapter 18. In this way, the
annular 74 and 76 has a centering effect upon engagement with regard to
the common axis of securing structure 14 and securing structure adapter
18.

[0057] In accordance with at least some embodiments of the present
disclosure, the securing structure adapter 18 has a sleeve-shaped
rotationally symmetrical member 106 made of metal, e.g. brass, which is
provided with a central receiving bore 108 for the shaft end 110 (FIG.
2), of appropriately conformed diameter, of the holding shaft 12.
Non-rotatable connection, correct with regard to angle of rotation, of
the member 106 with the shaft end 110 is effected by a cross-pin 112,
which engages in a transverse bore 114 in the shaft end 110 and at the
same time in a drive recess 116 in the member 106. The drive recess 116
is so tightly adapted to the cross-pin 112 that the member 106 cannot
rotate relative to the holding shaft 12 after fitting of the cross-pin
112. Only one drive recess 116 is provided, such that the securing
structure adapter 18 may be fitted to the holding shaft in only one
position with regard to angle of rotation.

[0058] Attached to, for example injection-molded onto, the member 106, is
an externally conical receiving element 118 for the securing structure
14. The receiving element 118 is or can be molded from a hard
thermoplastic, for example polyoxymethylene (PM), and has a cylindrical
receiving bore 120 for the hub portion 68 of the securing structure 14.
The upper edge of the receiving element 118 is shaped to form the
toothing 76. The receiving bore 120 ends at an inner surface 122 oriented
perpendicularly to the axis of rotation D, from which surface 122 there
protrude the projections 58.

[0059] In accordance with at least some embodiments of the present
disclosure, the projections are located on the securing member adapter
and the recesses on the securing structure.

[0060] According to another aspect of the present disclosure, the securing
member may comprise a hub portion comprising the positioning elements and
an outer or surrounding portion (e.g., an annular portion) connected
resiliently integrally formed, integrated, or otherwise provided
therewith, which bears or otherwise includes the drive elements (e.g.,
rotary drive elements) of the securing structure. The resilient
connection, forming, integration and/or other provision between or of the
surrounding portion and the hub portion allows simplified, improved
adaptation of the securing structure to the shape (e.g., convexity) of
the lens to be machined.

[0061] The above-mentioned connection between or formation of the hub
portion and surrounding portion may be achieved in number of ways, for
example, by way of a plurality of structures (e.g., webs), distributed
about (e.g., evenly about) the perimeter (e.g., circumference). During
injection-molding of the securing structure from a suitable thermoplastic
material, the various portions and/or structures (e.g., hub portion) may
be molded in one piece. By way of example, instead of individual
structures, a connection (e.g., a continuous, annular, thin-walled
connection) may also be provided, for example, at least partially between
hub portion and surrounding portion, which connection allows similar
flexible deformation between surrounding portion and hub portion for the
purpose of adaptation to lens shape (e.g., convexity).

[0062] The drive elements on the securing structure and on the securing
structure adapter are constructed, as complementary toothing or toothed
portions. This toothing has the effect of centering a securing structure
and securing structure adapter due to the radial tooth orientation
thereof optionally together with a complementary conical construction of
the toothing.

[0063] The securing structure 14 may be attached to lens L by way of an
adhesive film portion 78 having an adhesive on both sides. The adhesive
film portion 78 serves in mounting the lens L by way of the securing
structure 14 and is located after mounting and clamping between the
securing structure 14 and the lens L, as is clear from FIGS. 1 and 2. A
feature of the adhesive film portion 78 consists in the fact that the
adhesive applied to the side 80 thereof facing the securing structure 14
has a greater adhesive power than the adhesive applied to the side 82
thereof facing the lens L (FIG. 11), whereby stronger adhesion to the
lens L, which would be undesirable, is prevented.

[0064] The adhesive film portion 78 shown in FIG. 10, which has an
approximately circular external contour with a diameter corresponding
approximately to the external diameter of the surrounding portion 70 of
the securing structure 14, is provided with a tab 84 which simplifies the
removal thereof and is non-adhesive at least on the side thereof facing
the lens L, such that it cannot stick to the lens L.

[0065] With reference to FIGS. 12-14, securing structure 14 can be seen to
include a plurality of additional recesses or voids 200 (also referred to
as "recess structures" or "recessed or void structures" which are open at
a surface 202 for receiving an optical piece (e.g., a lens) and extend
into the structure, and more particularly as shown, into the hub portion
68, which is connected to surrounding portion 70. Recesses 200 are spaced
apart in a symmetric fashion and separated by, or otherwise spaced apart
by, a rib structure 210. In accordance with at least some embodiments,
lens-receiving surface 202 has a contour that is generally convex and a
portion of the surface extends to include, so as to coincide with, a
surface of the rib structure 238. In accordance with at least some
embodiments of the present disclosure and as shown, each of the recesses
200 are regions that take on a shape that is partially cylindrical or at
least substantially partially cylindrical (e.g. pie-shaped) and the rib
structure 210 can include a plurality of portions which together can
provide a cross or substantially cross-shaped form for the rib structure
210. As shown, each of the respective partially cylindrical recesses 200
comprises a region bounded on its sides by a pair of flat or
substantially flat surfaces or walls 212, along with an arcuate (e.g.,
cylindrical) or contoured surface or wall 214, and further bounded at a
respective base or interior-most contoured surface 218 (again while
opening at the lens-receiving surface 202). Recess contoured surfaces 216
are further included, in at least some embodiments, and join the
respective flat and arcuate side surfaces with the top surface 202. In
accordance with at least some embodiments of the present disclosure, rib
structure 210 is formed during manufacture of the securing structure 14
(e.g., molded) and constituent rib structure portions can be viewed to
intersect one another, and further, to separate respective recesses 200
from one another. Securing structure 14 also includes a contoured edge or
surface 206 adjacent or on top surface 202. In accordance with at least
some embodiments, edge or surface 206 comprises a convex shape. In at
least one aspect and by way of non-limiting example, the recess-rib
configuration of the present embodiment can be said to create a "cross
support system" which allows for true and complete center support to all,
or virtually all, lens sizes (e.g., radiuses), during lens edging or
finishing.

[0066] Referring to FIGS. 15 and 16, perspective and top views of another
securing structure 220 are shown in accordance with at least some
embodiments of the present disclosure. Securing structure 220 is similar
to structure 14 described above and so many of its details (e.g., details
regarding a manner of using the securing structure in conjunction with a
finishing apparatus) are not provided further here. For example, securing
structure 220 again includes plurality of recess structures or voids 222
which are open to a surface 223 for receiving an optical piece (e.g., a
lens), as well as a rib structure 224, which includes rib structure
portions (again by way of non-limiting example). Recesses 222 are spaced
apart, again in a symmetric fashion. In accordance with at least some
embodiments, lens-receiving surface 223 has a contour that is generally
convex and a portion of the surface extends to include, so as to coincide
with, a surface of the rib structure 224. In alternative embodiments, the
lens or other optic piece receiving surface can have a shape that is
concave, or still further, the shape can include a portion that is convex
and additionally include a portion that is concave. Recess structures 222
again comprise a shape that is partially cylindrical or at least
substantially partially cylindrical and rib structure 224 includes a
plurality of portions that provide across or substantially cross-shaped
form. As shown, each of the respective partially cylindrical recesses 222
comprise a region bounded on its sides by a pair of flat or substantially
flat side surfaces or walls 221, along with arcuate or contoured (e.g.,
cylindrical) side surface 225, and further bounded at a respective base
or interior-most contoured surface 229. Recess contoured surfaces 231 are
further included, in at least some embodiments, and join the respective
flat and arcuate side surfaces with the top surface of the securing
structure. Rib structure 224 is formed (e.g., during molding) and
separates respective recesses 234 from one another. Securing structure
220 again includes a hub portion 224 and a surrounding portion 226.
Securing structure 220 also includes a contoured or "soft" edge or
surface 227 adjacent or on top surface 223 which, it has been found, can
serve to reduce damage to lens during edging. In accordance with at least
some embodiments, edge or surface 227 comprises a convex shape.
Surrounding portion 226 includes two, opposing flat (or at least
substantially flat) surfaces or edges 228, which are used to accommodate
a lens that has a similar shape. In at least one aspect and by way of
non-limiting example, the recess-rib configuration of the present
embodiment can be said to create a "cross support system" which allows
for true and complete center support to all, or virtually all, lens sizes
(e.g., radiuses), during lens edging or finishing.

[0067] FIGS. 17 and 18 are top perspective and top views, respectively, of
another securing structure 230, in accordance with at least some
embodiments of the present disclosure. Securing structure 230 is similar
to structure 14 described above and so many of its details (e.g., details
regarding a manner of using the securing structure in conjunction with a
finishing apparatus) are not provided further here. Securing structure
230 again includes a hub portion 232 and a surrounding portion 233.
Surrounding portion 233 takes a generally oblong shape. Securing
structure 230 again includes plurality of recess structures or voids 234
which are open to a surface 236 for receiving an optical piece (e.g., a
lens), as well as a rib structure 238, which as shown, generally includes
only a single rib portion (again by way of non-limiting example). In
accordance with at least some embodiments, lens-receiving surface 236 has
a contour that is generally convex and a portion of the surface extends
to include, and so as to coincide with, a surface of the rib structure
238. Recess structures 234 take a partially cylindrical shape, or at
least partially substantially cylindrical shape. More particularly and in
accordance with at least some embodiments, each of the recess structures,
is semi-cylindrical, or at least substantially semi-cylindrical, in shape
(or a semi-circular in shape when viewed from the top view shown in FIG.
18). As shown, each of the respective recesses comprises a region bounded
on its sides by a flat or substantially flat surface or wall 237, along
with an arcuate or contoured (e.g., cylindrical) surface or wall 239, and
further bounded at a respective base or interior-most contoured surface
241. FIG. 23 is a sectional view of the securing structure 230 along
section line FIG. 23-FIG. 23 of FIG. 18, in accordance with at least some
embodiments of the present disclosure and illustrating recess structures
234. Rib structure 238 again is formed (e.g., during molding) and can
serve to separate respective recesses 234 from one another. Securing
structure 230 also includes a contoured or "soft" edge or surface 239
adjacent or on top surface 236 which, it has been found, can serve to
reduce damage to lens during edging. In accordance with at least some
embodiments, edge or surface 239 comprises a convex shape. In at least
one aspect and by way of non-limiting example, the recess-rib
configuration of the present embodiment can be said to create a "single
support" member or system that offers true center support, while also
allowing for the length of the securing structure to conform to all, or
virtually all, lens surfaces.

[0068] FIGS. 19 and 20 are top perspective and top views, respectively, of
another securing structure 240, in accordance with at least some
embodiments of the present disclosure. Securing structure 230 is similar
to structures 14 and 220 described above and so many of its details are
not provided further here. Securing structure 240 again includes a hub
portion 242 and a surrounding portion 243, which again is of a generally
oblong shape. Securing structure 240 again includes plurality of recess
structures or voids 244 which are open to a surface 246 for receiving an
optical piece (e.g., a lens), as well as a rib structure 248, which as
shown, generally includes only a single rib portion (again by way of
non-limiting example). In accordance with at least some embodiments,
lens-receiving surface 246 has a contour that is generally convex extends
to include, and so as to coincide with, a surface of the rib structure
248. Recess structures 244 each comprise a region that is similar to the
recess structures 234 of FIGS. 17 and 18 in as much as the regions
generally include a partially cylindrical shape, or at least a
substantially partially cylindrical shape. More particularly, the recess
structures 244 are bounded by fiat or substantially flat side surfaces
245a-c, an arcuate or contoured (e.g., cylindrical) surface 247, as well
as further bounded at a respective base or interior-most contoured
surface 249. FIG. 24 is a sectional view of the securing structure 240
along section line FIG. 24-FIG. 24 of FIG. 20, in accordance with at
least some embodiments of the present disclosure, and illustrating recess
structures 244. Rib structure 248 again is formed (e.g., during molding)
and can serve to separate respective recesses 244 from one another.
Securing structure 240 also includes a contoured edge or surface 251
adjacent or on top surface 246, which, it has been found, can serve to
reduce damage to lens during edging. In accordance with at least some
embodiments, edge or surface 249 comprises a convex shape. In at least
one aspect and by way of non-limiting example, the recess-rib
configuration of the present embodiment can be said to create a "single
support" member or system that offers true center support, while also
allowing for the length of the securing structure to conform to all, or
virtually all, lens surfaces.

[0069] FIGS. 21-22 are a bottom perspective view and a view from below (or
a bottom view), respectively, of the securing structures 230, 240 shown
in FIGS. 17 and/or FIG. 19, and each on a somewhat enlarged scale
relative to FIGS. 17 and/or 19, in accordance with at least sonic
embodiments of the present disclosure. Again, it is to be understood that
some allowance is provided for some difference in overall aspect ratios
of the respective securing structures (shown in FIGS. 17 and 19) due to
variations in the lens that is ultimately to be finished using the
securing structures. As can be seen, securing structures 230, 240 include
hub portion 232, 242 and a surrounding portion 233, 243. Rotary drive
elements 250 are formed on the securing structure 230, 240, which in
accordance with the present embodiments, take the form of toothing 252
functionally or operably similar to the exemplary annular toothing
described above with reference, for example, to FIGS. 6A-6B. This
toothing 252 is, slightly conical, being convexly conical on the securing
structure 14 and concavely conical on the securing structure adapter 18.
In this way, the annular 74 and 76 has a centering effect upon engagement
with regard to the common axis of securing structure 14 and securing
structure adapter 18.

[0070] In accordance with at least some embodiments of the present
disclosure, securing structures 14, 220, 230, and 240 comprise one or
more planes about which a plurality of respective recesses 200, 222, 234
and 244, respectively are at least partially symmetric, and
representative planes of symmetry "PS" are illustrated in exemplary
fashion in FIGS. 14, 16, 18 and 20. In accordance with at least some
embodiments of the present disclosure, such planes of symmetry can at
least partially coincide with at least a portion of at least one of the
rib structures 210, 224, 238 and 248 as shown. In accordance with at
least some other embodiments of the present disclosure, such planes of
symmetry can at least partially intersect, and in at least some such
embodiments bisect, at least a portion of at least one of the rib
structures 210, 224, 238 and 248 as shown.

[0071] Exemplary dimensions are provided in the tables below with respect
to the exemplary securing structures illustrated in the Figures and
described above in accordance with at least some embodiments of the
present disclosure. The exemplary dimensions provided include: (1) a
first larger or major diameter "LD" corresponding generally to a circular
region or perimeter of a respective securing structure, such as a
respective surrounding portion, or a portion of a respective surrounding
portion; (2) a second or smaller diameter "SD" corresponding at least
generally to a circular region or perimeter of a respective securing
structure, such as a respective portion that includes a plurality of
recess structures and which can correspond to, for example, a distance
separating arcuate (e.g., cylindrical) walls of opposite, symmetrically
disposed, recess structures; (3) a first rib structure width "RW1"
corresponding at least generally to a width of a rib structure or a
portion of the rib structure; (4) a second rib structure width "RW2"
corresponding at least generally to a width of a rib structure or a
portion of the rib structure, including particularly when the rib
structure includes a first rib structure width "RW1"; (5) a recess
structure depth, or recess depth, "RD" corresponding to a depth of a
respective recess structure, which, for purposes of the drawings, such
depth is measured from an outer surface of a respective hub portion (a
side opposite a respective optical piece receiving surface) of a
respective securing structure to a respective innermost surface of a
respective recess structure; (6) a spherical radius "SR" corresponding at
least generally to a curvature (e.g., convexity) of a surface, such as
the optical piece receiving surface, with such surface itself at least
generally considered as coinciding with a surface of an imaginary sphere
of having a radius equal to the respective spherical radius; (7) a flat
side width "FW" corresponding at least generally to a width of a flat or
substantially flat sided, or straight or substantially straight sided,
region of a respective securing structure, such as a respective
surrounding portion, or a portion of a respective surrounding portion;
(8) a length "L" corresponding at least generally to a length of a region
of a respective securing structure, such as a respective surrounding
portion, or a portion of a respective surrounding portion; (9) a width
"W" corresponding at least generally to a width of a region of a
respective securing structure, such as a respective surrounding portion;
and (10) an end radius "ER" corresponding at least generally to a
curvature of an edge or end of a surface, such an end or an edge of a
respective optical piece receiving surface, with such end or edge itself
at least generally coinciding with a surface of an imaginary circle of
having a radius equal to the respective end radius; and (11) a rib
structure length "RL" corresponding at least generally to a length of a
rib structure, or a portion of the rib structure.

[0076] The aforementioned dimensions are intended to be exemplary and not
limiting. It is understood that one or more of the dimensions may vary to
convenience and that the securing structures of the kind disclosed herein
can be sized in accordance with a wide number of factors, including the
type or size of lens to be machined, the particular machining apparatus
in which the securing structure is utilized, among others,

[0077] The aforementioned recess structures or recesses disclosed herein
can advantageously provide a better form accuracy due to a more even wall
thickness of the molded part, resulting in reduced variation from one
part to another during manufacture. In addition, it has been found that:
a) respective lens contacting surface is increased by of rib structures
(including rib structure portions) during edging or finishing of the lens
L, resulting in increased adhesion during edging; b) the recess
structures or recesses allow trapped air to escape during bonding,
further resulting in a stronger adhesion of the lens (since there is
little, if any, air inclusions); c) with increased adhesion, increased
forces and torque can be transmitted from the lens holding shaft of the
edge-machining apparatus to the lens and to resist cutting forces of the
tool; d) after edge processing, first-time-fit rate increases (e.g., a
spectacle lens that is finished has a increased likelihood of fitting
into a desired frame) as rotation or shifting of the lens L during edge
processing is reduced.

[0078] In accordance with at least one aspect of the present disclosure, a
securing structure for an optical piece is disclosed which comprises: a
hub portion; a surrounding portion connected to at least partially
surrounding the hub portion; a plurality of recess structures formed or
otherwise provided in at least one of the hub portion and the surrounding
portion and which are at least partially open on at least one side; and a
rib structure that at least partially separates the plurality of recess
structures. In at least some embodiments, the at least one side is a
lens-receiving surface and the surrounding portion includes a contoured
surface or edge near and/or adjacent the lens-receiving surface.

[0079] In accordance with at least one other aspect of the present
disclosure, an apparatus for securing and clamping optical lenses
requiring edge-machining is disclosed and which comprises: at least one
rotatable holding shaft; a securing structure positionable in relation to
the at least one holding shaft, and which is detachably attached to at
least one side of the optical lens; a securing structure adapter for the
securing structure, which is connectable to the at least one holding
shaft; and a clamping assembly connectable to the at least one holding
shaft. The securing structure comprises: a hub portion; a surrounding
portion connected to the hub portion; a plurality of recess structures
formed or otherwise provided in at least one of the hub portion and the
surrounding portion and which are at least partially open on at least one
side; and a rib structure that at least partially separates the plurality
of recess structures. In at least some embodiments, the at least one side
is a lens-receiving surface and the surrounding portion includes a
contoured surface or edge near and/or adjacent the lens-receiving
surface.

[0080] Various alternatives are contemplated and considered within the
scope of the present disclosure. The securing members of the kind
disclosed can have many variations as already noted. In addition, and as
shown, the overall shape of the securing (also called block or blocking)
member can vary to some degree while maintaining overall functionality.
For example, the outer edge can take a variety of forms, which can
include (as has been illustrated and/or already noted), an edge or
surface (e.g., an outermost edge or surface) that can be generally round,
truncated (e.g., round with straight edge or surface portions), or
generally oval in shape.

[0081] It should be understood that various changes and modifications to
the presently preferred embodiments described herein will be apparent to
those skilled in the art. Such changes and modifications can be made
without departing from the spirit and scope of the present subject matter
and without diminishing its intended advantages. It is therefore intended
that such changes and modifications be covered by the appended claims.